Staybolt



R. S. MENNIE.

ssssss LT.

APPLICATION FILED no.5, 1916. v 1,359,819, Patented Nov. 23,1920.

being formed in 'a sleeve which is fscrew UNITED STATES eENT orrles.

ROBERT s. MENNIE, or CHICAGO. ILLINOIS, nssreivon TO FLANNERY 'BoLr ooivrrAnY,

or PITTSBURGH, PENNSYLVANIA, A'CORPORATIONOF PENNSYLVANIA. f

sraYBo 'r.

, To all whom it may concern:

Be it known that I, RoBnRr S. VMENLDITIE,

a subject of the King of England, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new-and useful Improvement in Staybolts, of which. the following is a full, clear, concise, and

exact description. a

My invention relates to improvements in stay bolts, particularly those used in loco- -motive v boiler construction.-

In suchconstructions there is a relative movement between the outside sheet and the inside sheet which are-spaced only a few inches apart in certain places. The stay bolts therefore must permit this relative movement in, addition to preventing spread ing of said sheets due, to the pressure de-' veloped.

As heretofore constructed, such stay boltsashave gone into general commercial use,

provide 'a ball and socket joint,'th'e socket threaded into an opening in the sheet; The

sleeve is provided with'a cap to preventf :leakage of'the' waterwhich fills the space between-the sheets or of the steam above the water level. i i

' The operation of drillingand tappingthe,

holes in the outside sheets'is "expensive, as

sarily large toprovide room for the sleeve bolt and the walls of said opening. 1

One of the objects of the present invention is to form a socket in an openingjustlarge enough to accommodate the bolt, whereby these larger openlngs are avoided.

Another object is to provide a construe tion -wherein': the screw-threading" of the opening is dispensed with.

Another object 18 t pro tion wherein the head of the stay bolt is 1113 7 closed in'acap' which is welded to the outer sheet, whereby a permanently tight joint is,

secured. i

A further object is to provide a hollow stay, bolt in conjunctionwith such a cap,

Specification of Letters Patent. l

vide a construe i whereby the breakage of the-bolt indicated by] the blowing of water or steam into the fire box.

()th er objects and advantages will be apparent fromthe subsequent description of the various embodiments of the invention illustrated herein. y 1 v Figure 1 is a sectional elevation of one form of; hollow stay bolt-construction. 1

r Fig. 2 is asectional view showing a'modi renewals of the staybolts," etc. The space between the sheets is. filled with water up 'to a certain level, under the usual pressure of 7 1 about 200,pounds to the square inch. 7 The i v I Patented Nov. 23, 1920.1 "Application filed February}, 191 Serial No. 76,333. i ,7 a

and the inner isheetf2 I stay bolt3is designed to resist this pressure! I and prevent the sheets 1 and 2 from moving apart. Said stay bolt passeslthrough an opening 4 1n the outer. sheet, the outer part of: which opening. is fiared to provide a socket, the other end passing through a screw-threaded opening '5 in the inner; sheet.

the outer sheet being obstructed-to a certain extent; The head has'a square recess 7 there- The head of the stay bolt 6 is substantially,

spherical and the inner half thereof fits the corresponding socket, whereby considerable play is possible, leakage of the waterthrough,

inv WlliQllCOlIiHlllIliQitllQS through-an interme-- diate conical recess 8, with, a longitudinal opening 9' extending to the end of the bolt,

7 providing a, hollow construction. The re-' cess 7 maybe of any'non-cir'cular outline, whereby a tool may be inserted to rotate the,

stay boltand the'screw-threaded end 10 may be screwed-intotheinnersheetQ after which the projectinginnerend is riveted to form ahead -11. -Access maybe had to-said inner end sincefit projects into the fire box, but ac-V v cess-cannot belhad to-the space betweenthe,

sheets 'lqand 2 because of the narrowness of -The head of the bolt is the passageway. covered by a cap 12 the butt-portion-of which is welded to the sheet at 13, the Eweldedjoint passing entirely around the'cap. This weld sheet occurs however, in view is preferably accomplished by autogenous welding, using any one of the commercial methods.

It will be seen'that considerable relative movement of either sheet 1 or 2 in its own sealed up by a plug of welded metal 14. If

the stay bolt breaks, as frequently happens, a ii-ne'jet of water or steam is forced into the fire box and is readily noticed, particu-' larly at the endof the run when the fire is being drawn. No-leakage from the outer 7 of the tightly sealed cap.

The indication' ofthe break being plainly indicated, thecapmay be chipped oi? readily and a new stay bolt substituted for the broken one and a new cap welded in place.

" bolts, such inspectionv being required by the il S. Governmentat definite intervals. H01

Under the old practice, in order to ascertainthat thestay bolts were broken,'it was necessary to unscrew a great number of caps and make an inspectionof the heads of the low stay bolts of the" rigid type were also introduced, but Were objectionable owii'ig to the lack of play, as with all rigid forms of stay bolts. WVith my improved construction, an indication of a broken bolt is read- 11ygiven 'without removing thecaps and what is also important, there is no leakage through said caps. I

In Fig. 2 the cap 15 is somewhat flatter than in the first form illustrated, and the head of the bolt 16 is hemispherical.

It is obvious that certain features disclosed in connection with one figure may be employed in conjunction with features disclosed in the other figure and various forms of devices other than those disclosed or suggestedfherein may be devised, which fall within the spirit of the invention as defined by the scope of'the appended claims.

What I" claim 'as new-and desireto secure by Letters Patent of the United States is;

'1. The combination with an outer and inner sheet, of a stay bolt' passing through a-lined openings in said'isheets and having an enlarged head which, with the walls of the adjacent openin 'formsa flexible joint,

and acap i'nclosingsaidhead and having its 7 butt portion welded to said outer sheet, said stay bolt having a substantially central opening extending from the end'oppOSite' the head and terminating within said 'head but not openingthrough the latter;-

' cated at said open' end;

substantially as and for the purposes.v setv forth.

3. The combination'with an outer and inner sheet, of a stay bolt passing therethrough, said stay bolt being provided with longitudinal opening and having an enlarged head, a non-circularrecess in said head, a seat interposed betweensaid recess and said longitudinal opening adapted to.

receive a plug, and acap inclosing said head and havingits butt portion welded to, said outer sheet. V

' 4. The combination with an outer and inner sheet, of a-sta-y bolt passing there through, sa-id'stay bolt being provided with a longitudinal opening and having anenlarged head, a non-circular recess in saidhead communicating with" said opening, a

plug in said openinglying within the. plane 1 of said outer sheetfandacap-incl'osing said head. 1 7

' 5. A stay bolt having a longitudinal op'en ing therethrough and having an enlarged head at the outer'end, and a plug welded in said opening within saidhead whereby the outer end of said openingis closed and the inner end is unobstructed;

6. The combination with the adjacent double walls o'f a steam boiler, of a stay bolt passing through alined openings in said walls, said bolt having an enlarged'integrah head-with a spherical surface forming with the opening in the outer of the'two walls,

a ball and socket joint, the other'endof'said' bolt beinq upset,.wherebysaidwalls are pre;

vented from moving anartibut are'permitted' relative movement in their own planes, a cap inclosing said head and weldedto said outer wall', saidbolt' having a lon'gitudinal opening extending from the upset end to said head but not opening into-"the space beneath said cap, whereby leakage ofsteam or water through said ball" and socket joint into said space will not be indicated at the open end of said bolt, whereas breakage of the latter between said walls will be indi- 7; The combination withfan outer and inner sheet, of a stay bolt passingg'through alined openings in said sheets andbavinga" head which with thewalls'of thefadjacent' opening forms. afiexible joint, and a'ca-p inclosing said. head and welded to said outer' sheet, said stay bolt havingxan opening extendin" terminating within said head.

'8. In a stayboltconstruction, the comg from the end opposite-the-head-and:

binationwith innerandouter boiler sheets,

10 stress. I 9. The combination with an outer andinner sheet, of a stay bolt passing there through, said stay bolt being provided with a longitudinal opening and having an enlarged head, a non-circular recess in said 15 head, a seat interposed between said recess and semi longitudinal opening adapted to ree celve a plug, and .a CZLPlIlClOSlIlg said head and welded to said outer sheet.

in witness whereof I hereunto subscribe 20 my name.

- "ROBERT SME'NNIE. 

